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Spring</h1> <ul><li><p>2020年最全Spring面试题总结，“金三银四”戴上口罩不畏惧！</p> <ul><li><a href="https://juejin.im/post/5e3bbd336fb9a07ca24f402f" target="_blank" rel="noopener noreferrer">https://juejin.im/post/5e3bbd336fb9a07ca24f402f<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li></ul></li> <li><p>Java面试中常问的Spring方面问题</p> <ul><li><a href="https://juejin.im/post/5b6d33555188251b176a962b" target="_blank" rel="noopener noreferrer">https://juejin.im/post/5b6d33555188251b176a962b<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li></ul></li></ul> <h1 id="spring-demo"><a href="#spring-demo" class="header-anchor">#</a> Spring @demo</h1> <ul><li>Spring用到了哪些<code>设计模式</code>或方法</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token comment">// 设计模式</span>
<span class="token number">1</span><span class="token punctuation">)</span> 代理模式 <span class="token operator">--</span><span class="token operator">&gt;</span> <span class="token class-name">Spring</span> <span class="token class-name">AOP</span>
<span class="token number">2</span><span class="token punctuation">)</span> 单例模式 <span class="token operator">--</span><span class="token operator">&gt;</span> <span class="token class-name">Spring</span> <span class="token class-name">Bean</span> <span class="token class-name">Singleton</span>
<span class="token number">3</span><span class="token punctuation">)</span> 工厂模式 <span class="token operator">--</span><span class="token operator">&gt;</span> <span class="token class-name">BeanFactory</span><span class="token punctuation">,</span> <span class="token class-name">ApplicatonContext</span>
<span class="token number">4</span><span class="token punctuation">)</span> 模板模式 <span class="token operator">--</span><span class="token operator">&gt;</span> 解决代码重复的问题
<span class="token annotation punctuation">@eg</span>  <span class="token class-name">RestTemplate</span><span class="token punctuation">,</span> <span class="token class-name">JmsTemplate</span><span class="token punctuation">,</span> <span class="token class-name">JpaTemplate</span>
<span class="token number">5</span><span class="token punctuation">)</span> 包装器模式<span class="token operator">?</span><span class="token operator">?</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 动态数据库源
<span class="token number">6</span><span class="token punctuation">)</span> 观察者模式 <span class="token operator">--</span><span class="token operator">&gt;</span> <span class="token class-name">Spring</span>事件驱动模式
<span class="token number">7</span><span class="token punctuation">)</span> 适配器模式 <span class="token operator">--</span><span class="token operator">&gt;</span> <span class="token class-name">Spring</span> AOP的增强或通知<span class="token class-name">Advice</span>、<span class="token class-name">Spring</span> MVC适配<span class="token class-name">Controller</span><span class="token operator">?</span><span class="token operator">?</span>

<span class="token operator">==</span><span class="token operator">=</span>

<span class="token comment">// 方法</span>
<span class="token number">1</span><span class="token punctuation">)</span> 依赖注入
<span class="token number">2</span><span class="token punctuation">)</span> 前端控制器
<span class="token number">3</span><span class="token punctuation">)</span> 视图帮助
</code></pre></div><ul><li>Spring-<code>单例实现</code></li></ul> <div class="language-java extra-class"><pre class="language-java"><code>单例注册表
<span class="token class-name">ConcurrentHashMap</span>
</code></pre></div><ul><li><p>BeanFactory 和 FactoryBean @diff</p></li> <li><p><code>BeanFactory</code> 和 <code>ApplicationContext</code> @diff</p></li> <li><p>Spring Bean的<code>作用域</code></p></li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token number">1</span><span class="token punctuation">)</span> singleton <span class="token operator">--</span><span class="token operator">&gt;</span> 唯一<span class="token class-name">Bean</span>实例<span class="token punctuation">,</span> 单例
<span class="token number">2</span><span class="token punctuation">)</span> prototype <span class="token operator">--</span><span class="token operator">&gt;</span> 每次请求创建
<span class="token number">3</span><span class="token punctuation">)</span> request <span class="token operator">--</span><span class="token operator">&gt;</span> 每次HTTP请求
<span class="token number">4</span><span class="token punctuation">)</span> session <span class="token operator">--</span><span class="token operator">&gt;</span> 每次HTTP请求
<span class="token number">5</span><span class="token punctuation">)</span> global<span class="token operator">-</span>session <span class="token operator">--</span><span class="token operator">&gt;</span> 全局session作用域 基于portlet的web应用中 <span class="token operator">--</span><span class="token operator">&gt;</span> spring5中已不存在

<span class="token operator">==</span><span class="token operator">=</span>
portlet能够生成语义代码
</code></pre></div><ul><li>Spring Bean的<code>生命周期</code> <ul><li><a href="https://yemengying.com/2016/07/14/spring-bean-life-cycle/" target="_blank" rel="noopener noreferrer">https://yemengying.com/2016/07/14/spring-bean-life-cycle/<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li> <li><a href="https://www.cnblogs.com/zrtqsk/p/3735273.html" target="_blank" rel="noopener noreferrer">https://www.cnblogs.com/zrtqsk/p/3735273.html<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li></ul></li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token number">1</span><span class="token punctuation">)</span> <span class="token class-name">Bean</span>容器找到配置文件中<span class="token class-name">Spring</span> <span class="token class-name">Bean</span>的定义
<span class="token number">2</span><span class="token punctuation">)</span> <span class="token class-name">Bean</span>容器利用<span class="token class-name">Java</span> <span class="token class-name">Reflection</span> API创建一个<span class="token class-name">Bean</span>的实例

<span class="token number">3</span><span class="token punctuation">)</span> 如果涉及到一些属性值利用<span class="token function">set</span><span class="token punctuation">(</span><span class="token punctuation">)</span>方法设置
<span class="token number">4</span><span class="token punctuation">)</span> 如果<span class="token class-name">Bean</span>实现了<span class="token class-name">BeanNameAware</span>接口<span class="token punctuation">,</span> 调用<span class="token function">setBeanName</span><span class="token punctuation">(</span><span class="token punctuation">)</span>方法<span class="token punctuation">,</span> 传入<span class="token class-name">Bean</span>的名字
<span class="token number">5</span><span class="token punctuation">)</span> 如果<span class="token class-name">Bean</span>实现了<span class="token class-name">BeanClassLoaderAware</span>接口<span class="token punctuation">,</span> 调用<span class="token function">setBeanClassLoader</span><span class="token punctuation">(</span><span class="token punctuation">)</span>方法<span class="token punctuation">,</span> 传入<span class="token class-name">ClassLoader</span>对象的示例
<span class="token number">6</span><span class="token punctuation">)</span> 如果实现了其他<span class="token operator">*</span><span class="token punctuation">.</span><span class="token class-name">Aware</span>接口<span class="token punctuation">,</span> 调用相应的方法

<span class="token number">7</span><span class="token punctuation">)</span> 如果有和加载这个<span class="token class-name">Bean</span>的<span class="token class-name">Spring</span>容器相关的<span class="token class-name">BeanPostProcessor</span>对象<span class="token punctuation">,</span> 执行<span class="token function">postProcessBeforeInitialization</span><span class="token punctuation">(</span><span class="token punctuation">)</span>方法
<span class="token number">8</span><span class="token punctuation">)</span> 如果<span class="token class-name">Bean</span>实现了<span class="token class-name">InitializingBean</span>接口<span class="token punctuation">,</span> 执行<span class="token function">afterPropertiesSet</span><span class="token punctuation">(</span><span class="token punctuation">)</span>方法
<span class="token number">9</span><span class="token punctuation">)</span> 如果<span class="token class-name">Bean</span>在配置文件中的定义包含init<span class="token operator">-</span>method属性<span class="token punctuation">,</span> 执行指定的方法
<span class="token number">10</span><span class="token punctuation">)</span> 如果有和加载这个<span class="token class-name">Bean</span>的<span class="token class-name">Spring</span>容器相关的<span class="token class-name">BeanPostProcessor</span>对象<span class="token punctuation">,</span> 执行<span class="token function">postProcessAfterInitialization</span><span class="token punctuation">(</span><span class="token punctuation">)</span>方法
<span class="token number">11</span><span class="token punctuation">)</span> 当要销毁<span class="token class-name">Bean</span>的时候<span class="token punctuation">,</span> 如果<span class="token class-name">Bean</span>实现了<span class="token class-name">DisposableBean</span>接口<span class="token punctuation">,</span> 执行<span class="token function">destory</span><span class="token punctuation">(</span><span class="token punctuation">)</span>方法
<span class="token number">12</span><span class="token punctuation">)</span> 当要销毁<span class="token class-name">Bean</span>的时候<span class="token punctuation">,</span> 如果<span class="token class-name">Bean</span>在配置文件中的定义包含destory<span class="token operator">-</span>method属性<span class="token punctuation">,</span> 执行指定的方法
</code></pre></div><p><img src="/static/images/spring/spring-bean-lifecycle.png" alt=""></p> <ul><li>Spring Bean 的<code>生命周期如何被管理</code>的？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token comment">// 4种 管理 bean 的生命周期事件</span>
<span class="token number">1</span><span class="token punctuation">)</span> <span class="token class-name">InitializingBean</span> 和 <span class="token class-name">DisposableBean</span> 回调接口
<span class="token number">2</span><span class="token punctuation">)</span> 针对特殊行为的其他 <span class="token class-name">Aware</span> 接口
<span class="token number">3</span><span class="token punctuation">)</span> <span class="token class-name">Bean</span> 配置文件中的 <span class="token class-name">Custom</span> <span class="token function">init</span><span class="token punctuation">(</span><span class="token punctuation">)</span> 方法和 <span class="token function">destroy</span><span class="token punctuation">(</span><span class="token punctuation">)</span> 方法
<span class="token number">4</span><span class="token punctuation">)</span> <span class="token annotation punctuation">@PostConstruct</span> 和 <span class="token annotation punctuation">@PreDestroy</span> 注解方式
</code></pre></div><ul><li>Spring Bean 的<code>加载过程</code>是怎样的？</li> <li>Spring 是如何管理事务的，<code>事务管理机制</code>？</li> <li>Spring 的不同<code>事务传播行为</code>有哪些，干什么用的？</li> <li>Spring 循环注入的原理？</li> <li>Spring 如何保证 Controller 并发的安全？</li> <li>Spring中的<code>单例Bean的线程安全问题</code></li></ul> <div class="language-java extra-class"><pre class="language-java"><code>非静态成员变量的写操作存在线程安全问题

<span class="token comment">// 解决方法</span>
<span class="token number">1</span><span class="token punctuation">)</span> 定义<span class="token class-name">ThreadLocal</span>成员变量<span class="token punctuation">,</span> 把需要的可变成员变量保存在<span class="token class-name">ThreadLocal</span>中 <span class="token annotation punctuation">@nice</span>
<span class="token number">2</span><span class="token punctuation">)</span> <span class="token class-name">Bean</span>对象中尽量避免定义可变的成员变量 <span class="token annotation punctuation">@deprecated</span>
</code></pre></div><h1 id="spring-事务"><a href="#spring-事务" class="header-anchor">#</a> Spring-事务</h1> <ul><li>实现方式</li> <li>底层原理</li></ul> <h1 id="spring-事务-demo"><a href="#spring-事务-demo" class="header-anchor">#</a> Spring-事务 @demo</h1> <ul><li>Spring 管理事务的⽅式<code>有⼏种</code>？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token number">1</span><span class="token punctuation">)</span> 编程式事务
<span class="token number">2</span><span class="token punctuation">)</span> 声明式事务 <span class="token operator">--</span><span class="token operator">&gt;</span> 在配置文件中配置 <span class="token operator">--</span><span class="token operator">&gt;</span> xml <span class="token operator">+</span> annotation <span class="token annotation punctuation">@nice</span>
</code></pre></div><ul><li>Spring事务中的<code>隔离级别</code>有哪几种?</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token class-name">TransactionDefinition</span>

<span class="token number">1</span><span class="token punctuation">)</span> <span class="token class-name">TransactionDefinition</span><span class="token punctuation">.</span>ISOLATION_DEFAULT <span class="token operator">--</span><span class="token operator">&gt;</span> 数据库默认的隔离级别
<span class="token class-name">MySQL</span> <span class="token operator">--</span><span class="token operator">&gt;</span> REPEATABLE_READ
<span class="token class-name">Oracle</span> <span class="token operator">--</span><span class="token operator">&gt;</span> <span class="token class-name">READ_COMMITTED</span>

<span class="token number">2</span><span class="token punctuation">)</span> <span class="token class-name">TransactionDefinition</span><span class="token punctuation">.</span>ISOLATION_READ_UNCOMMITTED <span class="token operator">--</span><span class="token operator">&gt;</span> 可能脏读、幻读、不可重复读
<span class="token number">3</span><span class="token punctuation">)</span> <span class="token class-name">TransactionDefinition</span><span class="token punctuation">.</span>ISOLATION_READ_COMMITTED <span class="token operator">--</span><span class="token operator">&gt;</span> 可能幻读、不可重复读
<span class="token number">4</span><span class="token punctuation">)</span> <span class="token class-name">TransactionDefinition</span><span class="token punctuation">.</span>ISOLATION_REPEATABLE_READ <span class="token operator">--</span><span class="token operator">&gt;</span> 可能幻读
<span class="token number">5</span><span class="token punctuation">)</span> <span class="token class-name">TransactionDefinition</span><span class="token punctuation">.</span>ISOLATION_SERIALIZABLE <span class="token operator">--</span><span class="token operator">&gt;</span> 最高级别<span class="token punctuation">,</span> 但影响性能
</code></pre></div><ul><li>Spring 事务中哪⼏种<code>事务传播</code>⾏为?</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token comment">// 支持当前事务</span>
<span class="token class-name">TransactionDefinition</span><span class="token punctuation">.</span>PROPAGATION_REQUIRED
<span class="token class-name">TransactionDefinition</span><span class="token punctuation">.</span>PROPAGATION_SUPPORTS
<span class="token class-name">TransactionDefinition</span><span class="token punctuation">.</span>PROPAGATION_MANDATORY

<span class="token comment">// 不支持当前事务</span>
<span class="token class-name">TransactionDefinition</span><span class="token punctuation">.</span>PROPAGATION_REQUIRES_NEW
<span class="token class-name">TransactionDefinition</span><span class="token punctuation">.</span>PROPAGATION_NOT_SUPPORTED
<span class="token class-name">TransactionDefinition</span><span class="token punctuation">.</span>PROPAGATION_NEVER

<span class="token comment">// 其他情况</span>
<span class="token class-name">TransactionDefinition</span><span class="token punctuation">.</span>PROPAGATION_NESTED
</code></pre></div><ul><li><code>@Transactional</code>(rollbackFor = Exception.class)注解了解吗？
<ul><li><a href="https://developer.ibm.com/zh/articles/j-master-spring-transactional-use/" target="_blank" rel="noopener noreferrer">https://developer.ibm.com/zh/articles/j-master-spring-transactional-use/<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li></ul></li></ul> <hr> <h1 id="spring-mvc"><a href="#spring-mvc" class="header-anchor">#</a> Spring-MVC</h1> <ul><li>运行流程</li> <li>启动流程</li></ul> <h1 id="spring-mvc-demo"><a href="#spring-mvc-demo" class="header-anchor">#</a> Spring MVC @demo</h1> <ul><li>对<code>Spring MVC</code>的了解</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token comment">// Model1时代</span>
几乎全部用JSP <span class="token operator">+</span> 少量<span class="token class-name">JavaBean</span> <span class="token operator">--</span><span class="token operator">&gt;</span> JSP既是控制又是表现层

<span class="token comment">// Model2时代</span>
<span class="token class-name">Java</span> <span class="token class-name">Bean</span><span class="token punctuation">(</span><span class="token class-name">Model</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token function">JSP</span><span class="token punctuation">(</span><span class="token class-name">View</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token class-name">Servlet</span><span class="token punctuation">(</span><span class="token class-name">Controller</span><span class="token punctuation">)</span>

struts2 <span class="token operator">--</span><span class="token operator">&gt;</span> <span class="token class-name">Spring</span> MVC

<span class="token comment">// MVC框架</span>
<span class="token class-name">Service</span>
<span class="token class-name">Dao</span>
<span class="token class-name">Entity</span>
<span class="token class-name">Controller</span>

</code></pre></div><ul><li>Spring MVC的<code>工作原理</code>？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token comment">// 流程</span>
<span class="token number">1</span><span class="token punctuation">)</span> 客户端发送请求<span class="token punctuation">,</span> 直接请求到<span class="token class-name">DispatcherServlet</span>
<span class="token number">2</span><span class="token punctuation">)</span> <span class="token class-name">DispatcherServlet</span>根据请求信息调用<span class="token class-name">HandlerMapping</span><span class="token punctuation">,</span> 解析请求对应的<span class="token class-name">Handler</span>
<span class="token number">3</span><span class="token punctuation">)</span> 解析到对应的<span class="token class-name">Handler</span><span class="token punctuation">(</span><span class="token class-name">Controller</span><span class="token punctuation">)</span><span class="token punctuation">,</span> 由<span class="token class-name">HandlerAdapter</span>适配器处理
<span class="token number">4</span><span class="token punctuation">)</span> <span class="token class-name">HandlerAdapter</span>根据<span class="token class-name">Handler</span>调用真正的处理器<span class="token punctuation">,</span> 处理相关业务逻辑
<span class="token number">5</span><span class="token punctuation">)</span> 处理器处理完业务后<span class="token punctuation">,</span> 返回<span class="token class-name">ModelAndView</span>对象<span class="token punctuation">,</span> <span class="token class-name">Model</span>是返回的数据对象，<span class="token class-name">View</span>是个逻辑上的<span class="token class-name">View</span><span class="token operator">?</span><span class="token operator">?</span>
<span class="token number">6</span><span class="token punctuation">)</span> <span class="token class-name">ViewResolver</span>会根据逻辑<span class="token class-name">View</span>查找实际的<span class="token class-name">View</span>
<span class="token number">7</span><span class="token punctuation">)</span> <span class="token class-name">DispatcherServlet</span>把返回的<span class="token class-name">Model</span>传给<span class="token class-name">View</span>
<span class="token number">8</span><span class="token punctuation">)</span> 把<span class="token class-name">View</span>返回给请求者
</code></pre></div><p><img src="/static/images/spring/spring-mvc.jpg" alt=""></p> <hr> <h1 id="spring-aop"><a href="#spring-aop" class="header-anchor">#</a> Spring AOP</h1> <h1 id="spring-aop-demo"><a href="#spring-aop-demo" class="header-anchor">#</a> Spring AOP @demo</h1> <ul><li>什么是 <code>AOP</code>？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>横切关注与业务逻辑分开

<span class="token comment">// 好处</span>
减少重复代码
降低模块间的耦合度
可扩展
可维护
</code></pre></div><ul><li><code>Spring AOP实现原理</code></li></ul> <div class="language-java extra-class"><pre class="language-java"><code>JDK 动态代理
CGLIB 动态代理

<span class="token comment">// @attention</span>
如果某个类被标记为 <span class="token keyword">final</span>，那么它是无法使用 CGLIB 做动态代理的
</code></pre></div><ul><li>Spring<code>IOC</code>的理解，其初始化过程？
<ul><li><a href="https://javadoop.com/post/spring-ioc" target="_blank" rel="noopener noreferrer">https://javadoop.com/post/spring-ioc<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></li></ul></li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token class-name">IoC</span><span class="token operator">/</span><span class="token class-name">Inverse</span> of <span class="token class-name">Control</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 设计思想 
<span class="token class-name">IoC</span>容器实际上就是个<span class="token class-name">Map</span>
<span class="token class-name">Map</span>中存放的是各种对象

不用考虑对象是如何被创建出来的

<span class="token annotation punctuation">@demo</span> 不需要了解<span class="token class-name">Service</span>所有底层类的构造函数

<span class="token comment">// 初始化过程</span>
配置XML <span class="token operator">--</span><span class="token operator">&gt;</span> 读取<span class="token class-name">Resource</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 解析<span class="token class-name">BeanDefinition</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 注册<span class="token class-name">BeanFactory</span> 
</code></pre></div><ul><li>Spring AOP的理解, 各个术语, 他们是怎么相互工作的？</li> <li>Spring AOP 如何实现及<code>应用场景</code></li></ul> <div class="language-java extra-class"><pre class="language-java"><code>代理思想

<span class="token comment">// 场景</span>
记录日志 <span class="token operator">--</span><span class="token operator">&gt;</span> 不修改代码的情况下完成执行时间记录
监控性能 <span class="token operator">--</span><span class="token operator">&gt;</span> 监控方法运行时间 
权限控制
缓存优化 <span class="token operator">--</span><span class="token operator">&gt;</span> 第一次调用查询数据库，将查询结果放入内存对象， 第二次调用， 直接从内存对象返回，不需要查询数据库
事务管理 <span class="token operator">--</span><span class="token operator">&gt;</span> 调用方法前开启事务，调用方法后提交关闭事务
</code></pre></div><ul><li><code>CGLib</code> vs <code>JDK Proxy</code> @diff</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>有没有实现接口

<span class="token comment">// 性能</span>
<span class="token comment">// https://blog.csdn.net/xlgen157387/article/details/82497594</span>
<span class="token number">1</span><span class="token punctuation">)</span> <span class="token class-name">CGLib</span>所创建的动态代理对象在实际运行时候的性能要比JDK动态代理高不少，有研究表明，大概要高<span class="token number">10</span>倍；
<span class="token number">2</span><span class="token punctuation">)</span> 但是<span class="token class-name">CGLib</span>在创建对象的时候所花费的时间却比JDK动态代理要多很多，有研究表明，大概有<span class="token number">8</span>倍的差距

对于singleton的代理对象或者具有实例池的代理，
因为无需频繁的创建代理对象，
所以比较适合采用<span class="token class-name">CGLib</span>动态代理

<span class="token comment">// 除此之外</span>
<span class="token class-name">AspectJ</span> <span class="token operator">--</span><span class="token operator">&gt;</span> <span class="token class-name">Java</span>生态系统里最完整的AOP框架
</code></pre></div><ul><li><code>Spring AOP</code> vs <code>AspectJ AOP</code> @diff</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token class-name">Spring</span> AOP <span class="token operator">--</span><span class="token operator">&gt;</span> 运行时增强 <span class="token operator">--</span><span class="token operator">&gt;</span> 基于代理<span class="token class-name">Proxying</span>
<span class="token class-name">AspectJ</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 编译时增强 <span class="token operator">--</span><span class="token operator">&gt;</span> 基于字节码操作<span class="token class-name">Bytecode</span> <span class="token class-name">Manipulation</span>

<span class="token class-name">AspectJ</span>更强大也更复杂 <span class="token operator">--</span><span class="token operator">&gt;</span> 适合更多的切面场景
</code></pre></div><ul><li>如果要你<code>实现Spring AOP</code>，请问怎么实现？</li> <li>如果要你<code>实现Spring IOC</code>，你会注意哪些问题？</li></ul> <hr> <h1 id="spring-boot"><a href="#spring-boot" class="header-anchor">#</a> Spring Boot</h1> <h1 id="spring-boot-demo"><a href="#spring-boot-demo" class="header-anchor">#</a> Spring Boot @demo</h1> <ul><li><code>Spring Boot</code> 有哪些<code>优点</code>？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token number">1</span><span class="token punctuation">)</span> 基于spring
<span class="token number">2</span><span class="token punctuation">)</span> 模板<span class="token operator">+</span>版本<span class="token operator">+</span>配置的简化
<span class="token number">3</span><span class="token punctuation">)</span> 发展意见<span class="token operator">+</span>最佳实践
</code></pre></div><ul><li>什么是 <code>JavaConfig</code>？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>基于依赖注入原则的外化配置

<span class="token number">1</span><span class="token punctuation">)</span> 避免来回切换
<span class="token number">2</span><span class="token punctuation">)</span> 类型安全和重构友好

xml <span class="token operator">--</span><span class="token operator">&gt;</span> java config <span class="token operator">--</span><span class="token operator">&gt;</span> 混合配置是最理想的
</code></pre></div><ul><li>如何在 Spring Boot 中禁用 Actuator 端点安全性？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token class-name">HttpServletRequest</span><span class="token punctuation">.</span>isUserInRole
</code></pre></div><ul><li>如何实现 Spring Boot 应用程序的安全性？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token class-name">WebSecurityConfigurerAdapter</span>
</code></pre></div><ul><li>什么是 <code>Spring Batch</code>？--&gt; 处理大量记录</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>处理大量记录
<span class="token annotation punctuation">@eg</span> 日志<span class="token operator">/</span>跟踪，事务管理，作业处理统计信息，作业重新启动，跳过和资源管理

优化和分区技术 <span class="token operator">--</span><span class="token operator">&gt;</span> 极高批量和高性能批处理作业
</code></pre></div><ul><li>我们如何<code>监视</code>所有 Spring Boot 微服务？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token class-name">Spring</span> <span class="token class-name">Boot</span> <span class="token class-name">Actuator</span>
</code></pre></div><ul><li>如何<code>捕获业务异常</code>以及记录日志的？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token number">1</span><span class="token punctuation">)</span> 使用 <span class="token annotation punctuation">@ExceptionHandler</span> 注解
<span class="token number">2</span><span class="token punctuation">)</span> 实现 <span class="token class-name">HandlerExceptionResolver</span> 接口
<span class="token number">3</span><span class="token punctuation">)</span> 使用 <span class="token annotation punctuation">@ControllerAdvice</span> 注解

编译时异常
运行时异常<span class="token class-name">RuntimeException</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 规范代码
</code></pre></div><ul><li><code>@Component和@Bean</code> @diff</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Component</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 作用于类
<span class="token annotation punctuation">@Bean</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 作用于方法

<span class="token annotation punctuation">@Component</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 通过类路径扫描来自动侦测以及自动装配到<span class="token class-name">Spring</span>容器中 <span class="token operator">--</span><span class="token operator">&gt;</span> <span class="token annotation punctuation">@ComponentScan</span>
<span class="token annotation punctuation">@Bean</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 在标有<span class="token annotation punctuation">@Bean</span>注解的方法中定义产生这个<span class="token class-name">Bean</span><span class="token operator">?</span><span class="token operator">?</span><span class="token operator">?</span><span class="token punctuation">,</span> 需要用它的时候返还

<span class="token annotation punctuation">@Bean</span>注解的自定义性更强<span class="token punctuation">,</span> <span class="token annotation punctuation">@eg</span> 引用第三方库
</code></pre></div><div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Configuration</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">AppConfig</span> <span class="token punctuation">{</span>
  <span class="token annotation punctuation">@Bean</span>
  <span class="token keyword">public</span> <span class="token class-name">TransferService</span> <span class="token function">transferService</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">TransferServiceImpl</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><div class="language-xml extra-class"><pre class="language-xml"><code><span class="token comment">&lt;!-- 相当于xml配置 --&gt;</span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>beans</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>bean</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>transferService<span class="token punctuation">&quot;</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>com.acme.TransferServiceImpl<span class="token punctuation">&quot;</span></span><span class="token punctuation">/&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>beans</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><ul><li>将一个类声明为<code>Spring的Bean</code>的注解有哪些</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token annotation punctuation">@Component</span>
<span class="token annotation punctuation">@Repository</span> <span class="token operator">--</span><span class="token operator">&gt;</span> <span class="token class-name">Dao</span>层<span class="token punctuation">,</span> 数据库操作
<span class="token annotation punctuation">@Service</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 服务层<span class="token punctuation">,</span> 复杂业务逻辑
<span class="token annotation punctuation">@Controller</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 控制层<span class="token punctuation">,</span> 
</code></pre></div><hr> <h1 id="mybatis"><a href="#mybatis" class="header-anchor">#</a> Mybatis</h1> <h1 id="mybatis-demo"><a href="#mybatis-demo" class="header-anchor">#</a> MyBatis @demo</h1> <ul><li><code>Mybatis</code></li></ul> <div class="language-java extra-class"><pre class="language-java"><code>半 ORM（对象关系映射）框架
使用 XML 或注解来配置和映射原生信息
</code></pre></div><ul><li>Mybaits框架的<code>优点</code></li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token number">1</span><span class="token punctuation">)</span> SQL编程 <span class="token operator">--</span><span class="token operator">&gt;</span> 灵活
<span class="token number">2</span><span class="token punctuation">)</span> 解耦
<span class="token number">3</span><span class="token punctuation">)</span> 方便性能调优
</code></pre></div><ul><li>MyBatis框架的<code>缺点</code></li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token number">1</span><span class="token punctuation">)</span> SQL工作量大
<span class="token number">2</span><span class="token punctuation">)</span> 数据库移植性差
</code></pre></div><ul><li>MyBatis框架<code>适用场合</code></li></ul> <div class="language-java extra-class"><pre class="language-java"><code>需求变化多
</code></pre></div><ul><li><code>MyBatis与Hibernate</code> @diff</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>mybatis <span class="token operator">--</span><span class="token operator">&gt;</span> 半自动
</code></pre></div><ul><li>Mybatis里的<code>#{}和${}</code> @diff</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>#<span class="token punctuation">{</span><span class="token punctuation">}</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 预编译处理 <span class="token operator">--</span><span class="token operator">&gt;</span> 防注入
$<span class="token punctuation">{</span><span class="token punctuation">}</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 字符串替换
</code></pre></div><ul><li>Mybatis里的xml标签</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>select insert update delete 

resultmap 
parameterMap
sql
include
selectKey <span class="token operator">--</span><span class="token operator">&gt;</span> 为不支持自增的主键声生成策略标签

<span class="token comment">// 动态</span>
trim
where
set
foreach
<span class="token keyword">if</span>
choose
when
otherwise
bind<span class="token operator">?</span><span class="token operator">?</span>
</code></pre></div><ul><li>当实体类中的属性名和表中的字段名不一样, 怎么处理</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token number">1</span><span class="token punctuation">)</span> sql取别名
<span class="token number">2</span><span class="token punctuation">)</span> resultMap配置映射
</code></pre></div><ul><li>通常一个Xml映射文件，都会写一个Dao接口与之对应，<code>Dao接口的工作原理</code>是什么？Dao 接口里的方法，<code>参数不同时，方法能重载吗</code>？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token class-name">Dao</span>接口即<span class="token class-name">Mapper</span>接口 <span class="token operator">--</span><span class="token operator">&gt;</span> namespace

<span class="token class-name">Mapper</span>接口里的方法，是不能重载的
因为是使用 全限名<span class="token operator">+</span>方法名 的保存和寻找策略

原理是JDK动态代理
</code></pre></div><ul><li>Mybatis是如何进行分页的？<code>分页插件</code>的原理是什么？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token class-name">ResultSet</span><span class="token operator">+</span>内存分页 <span class="token operator">--</span><span class="token operator">&gt;</span> <span class="token class-name">RowBounds</span> 

<span class="token comment">// 分页插件 </span>
使用 <span class="token class-name">Mybatis</span> 提供的插件接口 <span class="token operator">--</span><span class="token operator">&gt;</span> 自定义插件 <span class="token operator">--</span><span class="token operator">&gt;</span> 拦截添加参数
</code></pre></div><ul><li>如何获取自动生成的<code>(主)键值</code>?</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>自增长策略 
insert会传回参数对象
</code></pre></div><ul><li>在mapper中如何传递<code>多个参数</code>? @ignore</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>好像是可以直接解析对象的呀<span class="token operator">?</span><span class="token operator">?</span><span class="token operator">?</span>

<span class="token comment">// 有一种诡异的写法, 封装成Map @deprecated</span>
<span class="token class-name">Map</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">&gt;</span></span> map <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">HashMap</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
map<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">&quot;start&quot;</span><span class="token punctuation">,</span> start<span class="token punctuation">)</span><span class="token punctuation">;</span>
map<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">&quot;end&quot;</span><span class="token punctuation">,</span> end<span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token keyword">return</span> sqlSession<span class="token punctuation">.</span><span class="token function">selectList</span><span class="token punctuation">(</span><span class="token string">&quot;StudentID.pagination&quot;</span><span class="token punctuation">,</span> map<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><ul><li>Mybatis的Xml映射文件中，不同的<code>Xml映射文件</code>，<code>id是否可以重复</code>？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>不同的<span class="token class-name">Xml</span>映射文件，如果配置了 namespace <span class="token operator">--</span><span class="token operator">&gt;</span> 那么 id 可以重复
如果没有配置 namespace <span class="token operator">--</span><span class="token operator">&gt;</span> 那么 id 不能重复；
</code></pre></div><ul><li>MyBatis 实现<code>一对一, 一对多</code>有几种方式,怎么操作的？ @digest</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token comment">// 方法</span>
<span class="token number">1</span><span class="token punctuation">)</span> 单独发一条sql去查询关联对象<span class="token punctuation">,</span> 赋值给主对象
<span class="token number">2</span><span class="token punctuation">)</span> 嵌套查询 <span class="token operator">--</span><span class="token operator">&gt;</span> 配置 collection<span class="token operator">?</span><span class="token operator">?</span>

<span class="token comment">// join查询出来的记录, 如何确定主对象个数??</span>
resultMap标签内的id子标签
指定了唯一确定一条记录的id列

id可以有多个<span class="token punctuation">,</span> 代表了联合主键的语义
</code></pre></div><ul><li>Mybatis 是否支持<code>延迟加载</code>？如果支持，它的实现原理是什么？ @digest</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>可配置lazyLoadingEnabled<span class="token operator">=</span><span class="token boolean">true</span><span class="token operator">|</span><span class="token boolean">false</span>

仅支持 association<span class="token operator">/</span>collection关联集合对象的延迟加载
association <span class="token operator">--</span><span class="token operator">&gt;</span> 一对一
collection  <span class="token operator">--</span><span class="token operator">&gt;</span> 一对多

<span class="token comment">// 原理</span>
使用 CGLIB 创建目标对象的代理对象

<span class="token comment">// @eg </span>
a<span class="token punctuation">.</span><span class="token function">getB</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

当发现a<span class="token punctuation">.</span><span class="token function">getB</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token keyword">null</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 再用事先保存的sql去查询关联数据
</code></pre></div><ul><li>Mybatis 的<code>一级、二级缓存</code> @digest</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>都是基于 <span class="token class-name">PerpetualCache</span> <span class="token operator">+</span> <span class="token class-name">HashMap</span>存储

<span class="token comment">// 一级缓存</span>
<span class="token class-name">Session</span>级别

<span class="token comment">// 二级缓存</span>
<span class="token class-name">Mapper</span><span class="token punctuation">(</span><span class="token class-name">Namespace</span><span class="token punctuation">)</span>，并且可自定义存储源，如 <span class="token class-name">Ehcache</span>。
</code></pre></div><ul><li>简述Mybatis的<code>插件运行原理</code>, 以及如何编写一个插件</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token comment">// 4种接口插件</span>
<span class="token class-name">ParameterHandler</span>
<span class="token class-name">ResultSetHandler</span>
<span class="token class-name">StatementHandler</span>
<span class="token class-name">Executor</span>

<span class="token class-name">InvocationHandler</span><span class="token punctuation">.</span><span class="token function">invoke</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
JDK 的动态代理拦截 <span class="token operator">--</span><span class="token operator">&gt;</span> 复写 <span class="token function">intercept</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
</code></pre></div><ul><li>Mybatis执行<code>批量插入</code>, 能<code>返回数据库主键列表</code>吗</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>能
</code></pre></div><ul><li>Mybatis-<code>动态标签sql的执行原理</code></li></ul> <div class="language-java extra-class"><pre class="language-java"><code>使用OGNL从sql参数对象中计算表达式的值
根据表达式的值动态拼接sql
</code></pre></div><ul><li>Mybatis如何执行`批处理1</li></ul> <div class="language-java extra-class"><pre class="language-java"><code>使用<span class="token class-name">BatchExecutor</span>
</code></pre></div><ul><li>Mybatis有哪些executor执行器 @diff</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token class-name">SimpleExecutor</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 每次执行update或select就开启一个<span class="token class-name">Statement</span>对象<span class="token punctuation">,</span> 用完关闭<span class="token class-name">Statement</span>对象
<span class="token class-name">ReuseExecutor</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 能重复使用<span class="token operator">?</span><span class="token operator">?</span>
<span class="token class-name">BatchExecutor</span> <span class="token operator">--</span><span class="token operator">&gt;</span> 与JDBC批处理相同

<span class="token class-name">Executor</span>的这些特点<span class="token punctuation">,</span> 都严格限制在<span class="token class-name">SqlSession</span>生命周期范围内  
</code></pre></div><hr> <h1 id="jpa"><a href="#jpa" class="header-anchor">#</a> JPA</h1> <h1 id="jpa-demo"><a href="#jpa-demo" class="header-anchor">#</a> JPA @demo</h1> <ul><li>如何使⽤JPA在数据库中<code>⾮持久化</code>⼀个字段？</li></ul> <div class="language-java extra-class"><pre class="language-java"><code><span class="token keyword">transient</span>
<span class="token annotation punctuation">@Transient</span>
</code></pre></div><h1 id="hibernate"><a href="#hibernate" class="header-anchor">#</a> Hibernate</h1> <ul><li>Hibernate最全面试题
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